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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.android.desugar;
import static com.google.common.base.Preconditions.checkArgument;
import com.google.common.io.ByteStreams;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.zip.CRC32;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
/** Output provider is a zip file. */
public class ZipOutputFileProvider implements OutputFileProvider {
private final ZipOutputStream out;
public ZipOutputFileProvider(Path root) throws IOException {
out = new ZipOutputStream(new BufferedOutputStream(Files.newOutputStream(root)));
}
@Override
public void copyFrom(String filename, InputFileProvider inputFileProvider) throws IOException {
// TODO(bazel-team): Avoid de- and re-compressing resource files
out.putNextEntry(inputFileProvider.getZipEntry(filename));
try (InputStream is = inputFileProvider.getInputStream(filename)) {
ByteStreams.copy(is, out);
}
out.closeEntry();
}
@Override
public void write(String filename, byte[] content) throws IOException {
checkArgument(filename.equals(DESUGAR_DEPS_FILENAME) || filename.endsWith(".class"),
"Expect file to be copied: %s", filename);
writeStoredEntry(out, filename, content);
}
@Override
public void close() throws IOException {
out.close();
}
private static void writeStoredEntry(ZipOutputStream out, String filename, byte[] content)
throws IOException {
// Need to pre-compute checksum for STORED (uncompressed) entries)
CRC32 checksum = new CRC32();
checksum.update(content);
ZipEntry result = new ZipEntry(filename);
result.setTime(0L); // Use stable timestamp Jan 1 1980
result.setCrc(checksum.getValue());
result.setSize(content.length);
result.setCompressedSize(content.length);
// Write uncompressed, since this is just an intermediary artifact that
// we will convert to .dex
result.setMethod(ZipEntry.STORED);
out.putNextEntry(result);
out.write(content);
out.closeEntry();
}
}
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